Bookkeeping machine



Dec. 22, 1931. w p s s 1,837,832

BOOKKEEPING MACHINE Filed Aug. 9, I928 9 Sheets-Sheet 1 INVENTOR k WHLTER J. flSI/VSKI ATTORNEYS Dec. 22, 1931. w, j s1 1,837,832

BOOKKEEPING MACHINE Filed Aug. 9, 1928 r 9 Sheets-Sheet 2 INVENTOR WALTER J. PHS/NSK/ BY m, QQWJ M ATTORNEYS Um" 22, W31. w. J. PASINSKI 1,837,832

BOOKKEEPING MACHINE Filed Aug. 9, 1928 9 Sheets-Sheet 3= r 4 INVENTOR WALTER J. PHSINSKI E1 10. a642, wla amwml ATTORNEYS Dec. 22, 1931, w J PASINSKH 1,837,,832

BOOKKEEP ING MACHINE Filed Aug. 9, 1928 9 Sheets-Sheet 4 lilililib i i?! INVENTOR WALTER J. Pas/mm ATTORNEYS Dec. 22, 1931. w J p slNsl-(l 1,837,832

BOOKKEEPING MACHINE Filed Aug. 9. 1928 9Sheets-Sheet 5 INVENTOR WALTER J. Pas/Nam 45, J42, MW

ATTORNEYS Dec. 22,1931; w PASINSKl 1,837,832

BOOKKEEPING MACHINE Filed Au 9, 1928' 9 Sheets-Sheet 6 il l llilllh inn'iiiliw' 70 IINVENTOR R Mu TER J. Pasuvsm I 8 BY I wQw Md ATTORNEYS 2 W.J. PASINSKI 1,837,832

BOOKKEEPING MACHINE Filed Aug. 9. 1928 9 Sheets-Sheet 7 INVENTOR WHLTER J HS/NSKI ATTORNEYS Dec. 22, 1931. 'w. J. PASINSKI BOOKKEEPING MACHINE Filed Aug. 9, 1928 9 Sheets-Sheet 8 IVETOR WHLTER J. PRSINSKI C) /JLMVM ATTOIRJNEY i L- /04 M5 W LEDGERI Dec, 22, 1931. w, PASINSKI 1,837,832

BOOKKEEPING MACHINE I Filed Aug. 9, 1928 9 Sheets-Sheet 9 M PICK-UP VITHDRAV DEPOSIT BALANCE O F IO0.00

25.00- 25.00- 50.00- 150.0 m lNVENTOR I WALTER J. PflS/NS/f/ Fig. 2 202,100,222;

ATTQRNEYS Patented Dec. 22,1931

UNITED STATES PATENT OFFICE WALTER (7. PASINSK I, OF DETROIT, MICHIGAN, ASSIGHOR TO BURROUGHS ADDING MA- CHINE GOMPAN Y, OF DETROIT, MICHIGAN, A CORPORATION OF MIOHIGAY BOOKKEEPING MACHINE Application filed August 9, 1928. Serial- No. 298,418.

This invention relates to a bookkeeping machine and it is. directed particularly to a construction for mechanically proving the correctness of the work done by theoperator.

In the use of bookkeeping. machines, it is often the practice, for example, in bank work, to enter a customers old balance by reading" it 01f his ledger sheet and entering it on the amount he s after which the machine is given a stroke 0 operation which results in printing the old balance in a designated column on the ledger sheet which is generally called the pickup? column. The machine is then tabulated to the next column where the debit items are entered, subtracted from the old balance, and printed in a withdrawal column. There may be one or more of these debit'columns followed by a credit or de: posit-column or columns where deposits are entered and printed. After the debits have been subtracted and the credits have been added, the machine is tabulated to another column, usuall called the balance column where a new alance is taken, printed'and 5 the machine cleared. The carriage is next tabulated to a proof column and this is generally done by automatically returning the carriage across the machine and stopping it in the proof column which is usually just ahead of the pickup column. It is the duty of the operator to again enter the old balance in the proof column by reading it from the entr on the ledger sheet from which it was 1 rst read and entering it on the amount keys of the machine. By requiring a second entry of the old balance, any mistakes that have been made in the first entry in the pickup column may be' caught because the operator is not liable to make the same mistake twice. It is desired that the operator be notified when a mistake has been made and one of the old methods of doing this is to print a special character opposite the old balance in the proof column. If no mistake has been made, this character can be printed, but-if there has been a mistake, it is impossible to print the character and the operator is thus given a signal or notified that there has been an error. Thejdifiiculty with this procedure is thatthe operator does not receive the signal until after the machine has been operated and the old balance printed inthe proof column, with the result that all the work must be done over again in the event that a mistake has occurred. Also, the catching of the error depends on the operator. If he fails to manipulate the special key the error will not be caught. It is highly desirable to catch the error automatically and to shorten the time required for the proving work. In so far as possible, the doing over of the work should be made unnecessary. The problem is complicated by the fact that the work in thefproof column must be checked against that in the prior pickup column, and the'latter may be any number of columns ahead of the proof column in the sequence of operations. While the carriage is in any of the intermediate positions the machine must be free to operate to perform allits normal functions. The present invention is directed to a solution of this problem.

The general object of the invention is to provide an improved automatic mechanism for proving the work done in certain columnar positions of the paper carriage of a bookkeeping machine.

A more particular object is to provide an improved mechanism for preventing effective operation of a bookkeeping machine when an entry in a proof column is not the same as an entry in a prior pickup column. I

Another object is to provide a means for an" tomatically preventing effective operation of a bookkee ing machine when the amount keys that are 'epressed in a certain columnar position of the paper carriage are not same amount keys that were depressed in a prior columnar position where the entry was to be made.

Still another object is to provide a machine which will be prevented from being operated when the second entry above described. is not of the same sign as the first entry.

Uther objects and advantages of time will appear from the specific. drawings.

'llhe invention 'comprehends a ing a mechanism which setthe of the paper carriage. When the carriage is moved away from this column,the mechanism is automatically moved to a non-operative position where it remains until a later predetermined column is reached'whereupon it is automatically moved to position to cooperate with the amount keys. If the same amount keys are depressed in the later column the machine is free to operate, but if the same keys are not depressed, operation of the machine is prevented. The mechanism is also controlled by the subtraction lever of the machine so that the entry in the second predetermined column must be of the same sign as the first in order for the machine to be operated.

An embodiment of the invention is shown in the accompanying drawings in which:

Figure 1 is a sectional side elevation of a Burroughs bookkeeping machine showing enough of the main parts to illustrate the machine to which the invention is applied, the mechanism of the invention being shown in the position the parts occupy when the carriage is in the pickup position. 1

Fig. 2 is a perspective view of one of the amount keys-of the keyboard together with the locking device associated therewith, the parts being shown in normal position.

Figs. 3, 4, and 5 are detail sectional side elevations of a detent associated with the locking device, said detent being shown in normal, partially depressed, and fully depressed position in the respective figures.

Fig. 6 is an enlarged sectional side elevation of two of the amount keys of the keyboard with the locking device associated therewith,

the parts being shown in normal position the same as in Fig. 2. v

Fig. 7 is an enlarged sectional side elevation similar to Fig. 6 showing theparts as they are positioned by the paper carriage when it is in the pickup column.

Fig. 8 is a view similar to Fig. 6 showing the position of the parts when one of the keys is depressed after the parts have been positioned as in Fig. 7

Fig. 9 is a view similar to Fig. 6 showing the position of the parts after the locking mechanism which has been set as in Fig. 8 has been withdrawn and the keys returned to normal.

Fig. 10 is a view similar to Fig. 6 showing the. position of the parts when the carriage is in its proof column, and before any keys have been depressed.

Fig. 11 is a view similar to Fig. 6 showing the position of the parts in the proof column when an attempt is made to operate the machine with the wrong key depressed.

Fig. 12 is a side elevation illustrating the mechanism for restoring the locking device to normal prior to restoring the amount keys.

memes Fig. 13 is a view similar to Fig. 12 showing the operation of the restoring mechanism in the proof column.

Fig. 14 is a side elevation of the locking connections for the motor starting mechanism showing the parts in normal position.

Fig. 15 is a detailed side elevation of a portion of the locking connections for the motor starting mechanism showing the parts in the position they occupy when the carriage is in pickup position and the motor starting bar is normal.

Fig. 16 is a view similar toFig. 15 showing the position of parts when the motor bar is depressed.

Fig. 17 is also a view similar to Fig. 15, but showing the position of the parts when the carriage is in its proof column and the motor starting bar is normal.

Fig. 18 is a side elevation of the locking connections for the motor starting mechanism showing the position of the parts when the carriage is in its proof column and the mechanism is locked against starting the machine.

Fig. 19 is a detail plan view illustrating how the locking mechanism is controlled by the control lever when said lever is in add position.

Fig. 20 is a view similar to Fig. 19 showing how the mechanism is controlled by the shift lever when it is in subtract position.

Fig. 21 is a side elevation of the restoring mechanism illustrating how it is operated by the general error key, the parts being shown in normalposition.

Fig. 22 is a detailed side elevation of the lower rear portion of the mechanism illustrated in Fig. 21, showing the position of the parts when the paper carriage is in the pickup column and the error key is undepressed.

Fig. 23 is a view similar to Fig. 21 showing the position of the parts in the proof column with the error key undepressed.

Fig. 24 is a rear elevation of the carriage controls for the locking mechanism.

Fig. 25 is a rear elevation of the upper part of the machine showing particularly the lock ing mechanism parts that are combined with the usual Burroughs construction.

Fig. 26 is a plan view of an example of work that may he performed on the machine.

The invention is illustrated as applied to a Burroughs bookkeeping machine the general features of which are sufficiently well known to make a detailed description unnecessary. Briefiy, the machine includes a plurality of actuator racks 610 carried by arms 611 whose rear ends support printing types 618 that may be driven 'into engagement with a platen P carried by the traveling paper carriage C. The carriage is automatieally tabulated back and forth across the machine to diflerent columnar positions by mechanism of the type disclosed in Rinsche Patent No. 1,580,534 to which reference is made for details. The machine has one or more counters 916 for cooperation with the actuator racks 610 and it is provided with a subtract lever 10, by means of which it may be conditioned for addition or subtraction. Items are entered in the machine on a plurality of amount keys 291 which, when depressed, rock bell crank detents 217 to pull wire stops 270 into positionto stop the actuator racks in differential positions. Depression of a key in a particular bank moves a slide 2l4 for.that-bank rearwardly which releases a latch 415 to release the rack bar 610.

The work is proved by preventing operation of the machine in the proof column unless the entries made in said column arethe same as those made in the pickup column. If no entries were made in the pickup column, none should be made in the proof column, the proving mechanism operating under these conditions also, as will be described later.

In order to lock the machine against operation, in the proof column,

mechanism is provided which is set by depression of the amount keys in the entering of an item in the pickup column, which mechanism allows free operation of the machine until the carriage reaches the proof column whereupon it acts to prevent operation of machine unless the same amount keys are depressed in the proof column as were de pressed in the pickup column. mechanism is associated with each bank of keys, but, inasmuch as the mechanism for each bank is the same, the description will be confined to one bank, it being understood that the constructions for the other banks-is the same. l

Referring to Fig. 2 which shows one of the amount keys 291,-1t will be observed that the stem of this key is provided with an extra slot 20, which, in certain positions of the parts. receives a stud 21 carried by a'detent 22. This detent is pivoted at 23 on a slide 24 that is mountedat the side of the bank of keys, being-guided and limited in its move.- ment by one or more studs25such as illustrated in Fig. 2. The detent 22 is held in either of its two positions, which will be later described, by means of a spring 26 one end of which is connected to, the stud 21 and the A locking stud 46 by spring 47.

- the detent 22 is cam shaped and two notches the position of Fig. 5 where the line of spring action A-B is below the pivot. From this it will be clear that the-spring 26 acts to hold the detent in either of its two-center positions after it has been moved across center.

- Each detent 22 is provided with a tailv 31 that is normally positioned above a slot 32 in the keyboard plate 33. When the detent is in its normal position, illustrated in Figs. 2

and 3, the tail piece is above the plane of the plate 33, but when the detent is moved downwardly to the Fig. 5 positiomthe tail 31 pro jects into the slot 32. If, while the detent is in the Fig. 5 position, the slide 24 is moved forwardly far enough, that is, to the left in Fig. 5, the detent will be carried sufiiciently to the left, if the slide is moved far enough, to cause the left hand edge of the slot 32 to engage the tail piece 31 and cam the detent back to normal position. bank may thus be restored by,.movements of the sliding bars 24 sufficient to cause any detents that are out of normal position to be. cammed back to normal.

When the paper carriage is in its'columnar positions for performing ordinary opera tions, the slide 24 with its detents 22 is in the position illustrated in Fig. 6, where the amount keys 291 are free to operate withoul having any effect on the detents and the machine functions in a normal manner.

When, however, the carriage is moved to the pickup column it acts automatically to move all the sides 24 rearwardly to position the studs 21 on the detents 22 in the slots 20 of the stems of the amount keys. The connections for accomplishing this-are illustrated most clearly in Figs. 1 and 24. The paper carriage C is provided with a large roller 4Q cooperating with one arm 41 of a pivoted yoke-shaped member 42 whose other arm 43 has a bifurcated-end engaging one end of a ivoted lever 44. The other end of lever 44 1s connected to a vertical link 45 which is urged upward to normal position against a The upper end of link 45 is connected by a pin and slot connection 48-49 to one arm of a bell crank lever 50 pivoted loosely on a shaft 51. The other arm of the bell crank lever is connected to a bail shaft 52 to which the rear ends of all of wardly a distance sufficient to move all of the studs 21 into the'slots in the key stems. The positions of the amount keys and the detents 22 under this condition'are illustrated k in Fig. 7.

Accordingly, when one of the amount keys is depressed when the machine is in the pickupcolumn, its detent 22 is rocked d('1wn\vardly, as illustrated for the right hand key in Fig. 8. Both the key and the detent are temporarily latched in position,

the key by the usual slide 214 heretofore mentioned and the detent by the soring26 and notch 29. When an item is entered in a the pickup column a certain number ofamount keys will be depressed and hence a certain number of detents corresponding to said keys will be depressed.

After an item has been entered on the keys .in the pickup column, the machine is given a forward and a return stroke of op eration and during. the latter part of the return stroke the carriage automatically tabulates to the next columnar position. As the carriage moves to the next column, roller 40 moves away from the arm ell, which is thereupon released, and the spring it draws upwardl'y on the link which rocks the bell crank lever clockwise and moves the bail forward to the Fig. 9 position to move all the slides 24 forward to remove the studs 21 fromthe slots 20. This occurs prior to the release of the amount keys and hence, When the studs 21 are moved out of the slots 20, the

detents that have been positioned by depresslon'of amount keys in entering the item in the pickup column remain depressed, the position of the parts being illustrated in Fig. 9. its the stroke of the machine is finished theamcunt keys are released b the usual releasing bail 202 and they move ack to normal undepr-essed positions for the entry of items in other columns, but their return to normal does not return the detents 22 to normal hecause all of them have been moved so that their studs 21 are out of slots 20.

lift is important that the detents be moved out of active position before the keys are released in crder-toprevent the restoration of the keys'froia restoring the detents to nor-- mal, and, while ordinarily thedetents are so moved because their controlling mechanism 7 is released by the carriage prior to the re lease of the amount keys, nevertheless pros. vision is made for positively insuring that nest n32 the parts will be operated in the desired se quence. The amount keys are released by the usual oscillating bell crank 622630 (Figs. 12 and 13) mounted on shaft 800 and carrying the pass-by pawl 628 urged to position by spring 618 and adapted to contact a roller 232 on one end of an arm 219 whose other end carries therelease bail 202 that contacts all of the latches 228 for the release of the key latching slides 21%. Pivoted on the shaft 623 as shown in Fig. 12 so that, the oscillating arm 630 moves counter-clockwise dur ing the latter part of the return stroke of the machine, the pawl 623 first contacts the roller and, if the slides or have not been previously moved forward by the action of spring 47 as previously explained, they are positively moved forward prior to the release of the amount keys, the latter being caused by the subsequent contact of the passby pawl 623 with the roller 232. In this manner forward movement of all of the detents is insured prior to release of the amount keys so that all of the studs 21 will be out of the slots 20 before the amount keys are raised to normal position. This forward movement of the slides 24: is not enough to cause the detents 22 to be cainmed back to normal ifthey have been depressed but leaves them in the position of Fig. 9.

From this it will be observed that the item entered on the amount keys in the pickup column is set up in the proof mechanism and thatsaid mechanism is then automatically moved out of active position where it will not be disturbedagain until Wanted for proof position by the spring 47 which holds the link 45 upward against the stud a6 andthc bail 52, with its slides 2 f forward. It is only when the carriage occupies a position Where the control roller at) moves the slides 24: rear-V ward that the detents 22 are positioned for operation by the amount keys.

I After the carriagehas gone through the necessary operations in intermediate columns lUU .llll.

it is tabulated .to the proof column where another roller 56 (Fig. 24) similar to the roller 46 but slightly smaller, moves the slides 24 rearward automatically to the position illustrated in Fig. 10, where the'studs 21 are just short of the forward edges of the keystems. The parts are stopped in this position so as to leave the amount-keys free for manipulation without frictional contact with the studs 21. When the carriage isin the proof column, it is the duty of the operator to again enter the old balanceon the amount keys and, if this is entered correctly, the same keys should be depressed as were depressed when the amount was entered in the pickup column. If this is done, the slots 20 in the depressed keys will be opposite the studs 21 of the detents 22 that were depressed in the pickup.column and which still remain depressed and all the slides 24 will be free to move rearward which they must do in order a for the motor starting mechanism to operate as will be later described. If an error has been made by the depression of a key that was not depressed in the pickup column, the slot 20 in the stem of the wrongly de ressed key will move away from the path of t e stud 21 of the detent for that'ke as illustrated in Fig. 11.- Also, if one of t e keys that previously had been depressed is not depressed, the slot 20 in the stem of that key will not be moved down where it will be in the path of stud 21 of the depressed detent 22 for that key as is also illustrated in connection with the right hand kev in Fig. 10. In other words, unless exactly the same keys are depressed in the proof column as were depressed in the 'pickup column, one of the slides 24 will be blocked against rearward movement because of the engagement of the stud 21 on one of its detents 22 with the edge I of one of the keystems. Inasmuch as all of the slides 24 are connected to the cross-shaft or bail 52 rearward vmovement of this bail is prevented and this prevents starting of the motor as will now be described.

- It will be plain that if no keys were depressed in the ickup column the locking action willtakep aceif any keys are depressed in the .proof column. In such event none of the detents 22 would have been depressed in the pickupcolumn and hence all the keys would have to remain undepressed in the proof column. Otherwise, one of the slots 20 in the depressed key would be out of line with its undepressed detent and rearward movement of its slide 24 would be prevented.

Locking connections for'power drive The motor is caused to give the machine a stroke of operation by depression of the ,usual 'startinggbar 6O (Fig-14) which rocks the lever 61" counter-clockwise and, through the spring 62, moves the link 63 upwardly. Up-

spring 68 whose other end is connected to a hooked projection 69 on a link 70 having an abutment projection 71 for engaging the square stud' 72 on the vertical. link 63. The forward end of the link 70 is bifurcated and it straddles a stud 73 on the lever 66. The link 70 also has a cam surface 74 engaging a stud 75 on an arm 76 projecting rearwardly from the lever 66. The spring 68 provides a yieldin connection between the lever 66 and the lin r70,thellever 66 being also urged clockwise by a spring 77. In normal operation, depression oflthe bar rocks lever 61 counterclockwise which tensions spring 62 and raises the link 63 to start operation of the machine. When lever 61 is rocked, it cams lever 66 counter-clockwise which pulls the link 70 to the left in Fig. 14to cause abutment 71 to pass far enough to the left across the path of stud72 to permit free upward movement of link 63. s

The rear end of the link 70 is provided with a T-shaped slot 80 having a vertical portion 81 A stud 82 operates in the T-shaped slot, said stud being on the lower end of an arm 83 pivoted loosely on shaft 51 and being connected to the bail 52 to which the slides 24 are connected. a

The normal position of the parts is illustrated in Fig. 14 where the stud 82 is in the horizontal part of the slot 80 and slightly to the rear of the vertical portion 81. When the motor bar is depressed under these conditions, the stud 64 contacts the surface and cams the lever 66 counter-clockwise which pulls the link forward, the link beingfree to move because the stud 82 moves freely in the slot 80.

When the carriage positions the bail 52so as to move all the slides 24 rearwardl as it doesin the pickup column, the stu 82 is positioned in the forward part of the slot as illustrated in Fig. 15. Here again the link 70 is free to move forward'when the motor bar is depressed, the position of the link with the motor bar depressed being shown in Fig. 16.

When, however, the carriage positions the bail 52 in its intermediate position, as it does when the carriage is in the proof? columiaii pressed, the first action caused by the contact of stud 64 with surface 650i arm 66 which 70 counter-c100 ise which moves the vertical portion 81 of the slot 80 over the stud 82 therewa'rd movement of this link starts the drivby locking the link 70 to the arm 83. When 17. Accordingly, when the motor baris deacts through spiing 68 is to swing the link o n v a; u

the link 70' and arm 83 are connected together, further movement of the link 70* ton ward will tend-to rock the arm 83 clockwise and, it the same amount keys have been de-' pressed in the proof column as were depressed in the fpiclrup column, the motor is started as usual, it, however, any of the wrong keys have been. depressed or the right ones have not been depressed, some of the slides 24- are blocked in the manner heretofore explained and the bail 52 with its arm 83 cannot move and the link 70, likewise, cannot move forward. Depression of the motor bar rocks the lever 66 countenclochwise but, the linlt 79 being blocked, the only result is the stretching oi spring The abutment 71 on link is not moved far enough forward to clear the path of tie square stud 72 on the 63 hence the link 63 cannot rise to a position to start the motor.

I In order to preve inisoperation by acciengagement 01. one stud 82 in the vertical portion 81 of the slot when the link '39 is movin hack and forth, a ti -shaped lock 841- is provided which is positioned to cooperate with the hook-shaded end 85 the arm 86 integral with the end oi the link 70. Vi hen the linlr 70 is moved forward under "iormal conditions from the position. of Fig. to in, the hook-shaped end moves under the Vehaped member 8dand loclrs the li 70 against vertical movement. The same tiring occurs when the link 79 is r forward the ig. 15 position. i unit; '50 is moved upwardly as in 18 such movement occurs prior to any "forward movement of the link and the hooked end 85 moves out of the vicinity or" the v shaped member 84-. lt is only when the arts are in the lt i 1? position that the link Qcan swing upward to affect a locking action.

Uontrol by subtraction Zeoer llt' is important, it the item entered in the machine when the carnage is in pickup position is entered wlth the subtraction lever in addition position, that the subtraction lever be in the same position when the item is scribed, it being also connected to the bail 52 to which said slides are connected. Mounted on the end of this slide is a detent 91 having a double-notched end 92 cooperating with a stud 93 and provided with a spring 94 for tions shown.

see

holding it in position, one end of the spring being connected to the stud 93 on the slide and the other to a stud 95 on the pivoted de-' tent 91. The stud 95 is adapted to move into notch 96 in a pivoted arm 97 having a cam slot 98 in which the subtraction lever 10 operates. The operation ot this control is, in general, the same as that previously described for the amount keys, to Wit:

Assume that the lever 10 is in the addition position illustrated in Fig. 19 and that the detent 91 is in the position there shown on the slide 99, but the slide is in its "forward position such that the stud 95 is not in the slot 96. When the carriage tabulates to its pickup position the slide 90 is moved rear- Wardly together with the slides and the stud .95 moves into the slot 96. It the subtraction lever remains in its addition position the parts remain in the relative posi- W hen the paper carriage moves away from the pickup position the slide 90 is moved forward so as to remove the stud 95 from the slot 96 and the subtraction lever may be freely moved without affecting he detent 9T. Whemthe-carriage reaches the proof column, the slide 90 is again moved r-carwardly but not so far, the distance being simply enough to bring the stud 95 to a position slightly short of the edge ot the 97. If, in the proof column, the subtraction lever remains in'addition position the slide 99 is :free to move farther rearwardly With the slides 24 in the starting of the motor and there Will not be any blocking of the starting mechanism, but if the subtraction lever should be moved to subtraction position in the proof column, the lower edge of the arm 9'? will move in front of the stud 95 and full rearward movement of the slide 99 cannot talre place until the subtraction lever is moved baclr to addition position to locate the slot 96 in front of the stud'95. This blocks operation of the machine in the same manner as when one of the slides 24 is blocked,

it, when the carriage is in the pickup column, and after the slide '90 has been moved rearward by the carriage so as to position the stud 95 in the slot 96, the subtraction lever is moved to subtraction position, the parts will be moved to the position illustrated in Fig. 20. The detent 91 is moved to its second position Where it will be held by the spring 94.

[is the carriage tabulates, the slide 9O again moves forward and the stud 95 moves out of the slot 96. When the carriage reaches the proof column, the slide 90 is returned rear- Wardly a short distance sufficient to position the stud 95 iust short of the lower edge of the arm 97 if the subtraction lever remains in subtraction position the slot QGremains in front of the stud 95 and slide 90 is free to move rearwardly to permit operation of the motor starting mechanism, but it, under these conditions, the subtraction lever should be moved to addition position, the edge of the lever or arm 97 will move in front of the stud 95 and rearward movement of the slide 90 will be blocked so as to prevent starting of the motor.

In this manneroperation of the machine prevented unless the subtraction lever occupies the same position in the proof column as it occupied in the pic p column,

The detent 91 normally occupies the addition position of Fig. 19. When it is moved to the subtraction position of Fig. 2 0 it is later restored to addition or normal position atthe time all the parts are restored. This isdone by means of a pin 99 which is posi tioned so that when the slide 90 is moved forward to release the parts, as will be later described, the detent 91 strikes the pin 99 and is moved to the Fig. 19 position.

Releasing means The mechanismmay be released'in several ways, depending upon the error involved and the desires of the operator.

Assume that the machine has reached the proof column and that a wrong key has been depressed or that one of the keys that should have been depressed has not been depressed. Depression of the motor bar will not operate themachine and the operator immediately knows that an error has been made somewhere and he is notified of this fact before the error is printed. His first check is to see whether there has been an error in making the entry in the proof column. To do this, asidefrom observing the keys depressed, he must release the amount keys and enter the item (old balance) again.

He can easily release the amount keys by depressing the usual column release keys R (Fig.1) for the banks of keys in which amount keys have been depressed. This simply restores the amount keys and does not disturb the slides 24 and the associated looking mechanism. He does not want to move the slides 24 to release the detents 22 because, if he did so, the'set up of the pickup column item (the first entry of the old balance) would be released from the proving mechanism, aresult that is not yet desired.

Instead of using the column release keys for releasing the keys the operator may use the general error key E which is arranged so that, by a partial depression, the amount keys will bereleased without releasing the detents 22,.whereas by full depression both the amount keys and the detents will be re-- leased. This mechanism is illustrated in Figs. 21, 22 and 23. v

The error key E is carried by a bell crank lever 100 having a link 101 pivoted to its end. The outer end of this link has a slot 102 in it which operates over a stud 103 on the arm 21 9 carrying the bail 202 which releases the latches 228 for releasing the amount keys. The link 101 also has a downwardly extending branch 104 having a stud 105 adapted to engage the end of a pass-by pawl 106 pivoted at 107 to an arm 108 pivoted on the shaft 51 and connected to the bail 52 that controls the slides 24 and 90. The pawl 106 has a nose 109 positioned to engage a stud 110 on a stationary member 111 supported on shaft 51 and provided with an arm 112 having a bifurcated end straddling'the shaft 121 on which'the arm 219 is pivoted. The member 111 is thus held against rocking movement. The pawl 106 is normally maintained in engagement with. thestud 110 by a spring 113. In the no roller positions of the carriage where the bail 52 is not moved but occupies the Fig. 21 position, the pawl 106 is maintained out of and below the path of the stud 105 as illustrated. When the carriage is moved to the pickup column, the bail 52 is rocked rearward, as viewed in Fig. 21, by means ofthe large roller 40 on the carriage acting through the'link 45. This moves the arm 108 with its pawl 106 to the position of Fig.22 where the stud 110 cams the pawl to the Fig. 22 position where it ,is above the path of stud 105. When the carriage is moved to any of its intermediate n0 roller positions prior to reaching the proof column, the partsloccupy the Fig. 21 position above described. When the carriage moves to the proof column, the smaller roller 56 acting through link 45 rocks the bail 52 to a position which moves arm 108 to the position of Fig. 23 where the pawl 106' is in the path of the stud 105. If the error key E is fully depressed when the parts are in this position, the stud 105 will engage the end of pawl 106 and rock the arm 108 counter-clockwise. This rocks the bail 52 forward which moves the slides 24 (and forward far enough to cause the detents 22 to be restored to normal by the camming action of the keyboard plate 33 heretofore explained,

From the above it will be clear that, when the carriage is in any of'its poistions other than the proof position, the error key E may be depressed to release the amount keys in the usual manner without disturbing the proof mechanism but, when. the carriage is in its proof position, fulldepression of the error key. will restore the proof mechanism vto normal as well as release the amount keys.

the arm 219 to move bail 202 to release the latches 228 to thereby release the amount keys, but the stud 105 does not move far enough to engage the pawl 106 so that the locking mechanism is not released, the position of the parts being shown in dotted lines in Fig. 23.

Returning now to the proving operations, let it be assumed that the machine did not operate in the proof column and that the operator has restored the amount keys either by depressing the individual column release keys or by partially depressing the error key. He then carefully enters the'item (old balance) again and, if it is entered correctly and if the error Was in the proof column, the machine can be operated. He can thus quickly correct an error in the proof column without having had it printed on the ledger sheet and without having to start the entire posting operation over again.

It may happen that the error is in the position of the subtraction lever in the proof column.- This would prevent operation of the machine the same asif an error had been made on the amount keys. This error would ordinarily be checked at the same time that the second entry in the-proof column was made because the operator, in making the second entry, would be careful to enter the old balance as of the correct sign as well as the correct amount.

If, after making the second entry in the proof column to check the'correctness of the work in the proof column as to sign and amount, the machine will not operate, the operator knows that the error has occurred elsewhere, to-wit, in the first entry in the pickup column. The condition is that, although the correct amount keys are depressed and although the subtraction lever is in cor rect position in this proof column, the setup in the proof mechanism does not correspond because this set-up was incorrectly put into the proof mechanism by an incorrect entry of the old balance when it was first entered in the pickup column. This error can be checked b observing the printed entry that was mach; in the pickup column on the ledger sheet. In the event of such an error it is ncessary to do the work over again. The operator moves the Carriage back to the pickup column and after running a pencil or pen line through the incorrect posting, starts over again. It should be noted that, although the work must be done over again when the error is made in the pickup column, it is impossible to proceed in the proof column under said condition. The machine is automatically locked against operation and the operator notified of the error. The notification does not depend upon the operator manipulating some special key to test for an error, an operation that might easily be overlooked. llnstead, the notification is automatic and it is definite, in that,

no operation of the machine results when the motor bar is depressed. The notification always occurs before printing in the proof column which saves a tremendous amount of time if the error happens to be in the proof column because, in such event, the machine is unlocked when the correct keys are depressed and when the subtraction lever is put in the correct position, whereupon the operations may proceed without requiring that any of the work bedone over again such as would be necessary if the notification did not take place until after-an erroneous entry had been made in the proof column.

It will be readily understood that if an error should be discovered in the depression of the'keys or the position of. the subtraction lever in the pickup column, and before the machine had been operated in said column; the parts can be readily restored to normal by depression of the general error key. This restores the amount keys and the subtraction lever to normal in the usual manner and it also restores the detents 22 be-- cause, at that time, the detents are positioned so that their studs 21 are in the slots 20 of the amount keys and restorationof the keys restores the detents. The same thing applies to the detent 91 which is in the slot 96 of the subtraction lever.

Restoring mechanism When operations have been completed in the proof column it is necessary to restore all the parts to normal and this is done automatically.

Referring to Fig. 12, the amount keys 291 are released in the usual manner by rocking of the restoring bail 202 through the passby pawl 623 and arm 630, which releases the latches 228 and permits the amount key slides 21% to move forward. The pass-by pawl (323 also contacts the roller on arm 54:, but, even though this happens, it does not release the detents 22 (and 91) because the parts are proportioned so that the pawl 623 never moves the arm .54 far enough to move the slides 24 (and 90) sufiiciently to cam the detents 22 to normal. Accordingly, some other provision must be made for releasing the detents and this takes the form of ar arm 120 shown in 13. This arm is fixed to the shaft 121 which rocks with the arm 219. llts lower end is positioned. to contact a stud 122 on a downward projection 123 on the link 70.: -When the link Z0 is swung upward to the position of Fig. 13, as it is when the motor bar is depressed in the proof column, as heretofore described, the link is connected to the arm 83. Near the end of J the return stroke of operation of the machine, the shaft 121 is rocked counter-clockwise by means of the shaft 600, arm 630, pawl 623 and roller 232 on the arm fixed to the shaft 121. The arm 120 is positioned the detents 22 on sli es ,.24; to engage the keyboard plate'33 which cams them back to normal. The detent 91 on slide 90 engages the stud 99- which cams it back to normal. The operation of the parts is, of course, timed so that the above action takes place before the link 70 is disconnected from the arm 83 at the end of the operation of the machine. Inasmuch as the link 70 is not connected to the arm 83 in any position of the carriage other than the proof position, it will be evident that the above automatic restoring.

of-the motor bar he knows that the error has o (1 balance in the proof column.

action takes place only in the proof column.

Sample of work A sample of the work that may be performed is illustrated in Fig. 26 which shows a sample entry of items on a sim'ple bank' ledger.

In'this sample, a depositor has an old bal-' ance of $100.00. When the operator icks the ledger sheet he enters the old ba ance $100.00in the pickup column and the machine then automatically tabulates to the withdrawal column where an item of $75.00 is entered indicating that the customer has withdrawn $7 5.00. The machine then tabulates to the deposit column where a $200.00 credit item is entered indicating that the customer has de osited $200.00 to his account. The mac ine then tabulates to the balance column where a new balance is taken and printed, which, in this case, shows as a $225.00 credit or. deposit balance. An asterisk is printedopposite it indicating that it is a deposit balance. The carriage then automatically returns, across the machine to the proof column and here the operator must again look at the old balance of $100.00 and re-enter it, that is, he must re-enter the balance by reading the entry that he first read from the ledger sheet. If the old bal ance is entered correctly, the starting bar may be operated and the machine tabulates over to the pickup column for the next operation- However, if a mistake has been made in the entry of the old balance, depression of the start ng bar will not result in an o eration and there will be no printin of the nstead, the operator will be immediatcl notified that an error has been made and e is notified prior to'the printing .operation. He can then depress the column release keys or partially depress the error key and re-enter the old balance in the proof column, being careful to have it correct both as to amount and sign. If the machine then operates on depression been corrected, but, if it does not operate, he knows that an error has beenmade in the original entry in the ickup column so that it is necessary to do t e ,work over again.

He can condition the machine for this urpo'se by fully depressing the error key w ich releases the amount keys together with the slides 24 and 90 and their detents so that the item can be again entered. in the pickup column and the operations repeated.

Among the advantages of the construction it will be readily appreciated that one of the most important ones is that the existence of an error is indicated before printing occurs in the proof column which permits a correction 1f the error has been made in that column and a proceeding with operations without having to return and doall the work over again. Also, the operator cannot o ahead and make .other entries and get 1; e account mixed up so that an entire rechecking is necessary.

t is to be understood that the construction shown is for purposes of illustration only and that variations may be made in it with.- out departure from the spirit and scope of the invention as defined by the appended claims.

' I claim: I

1. In combination, in a calculating machine having depressible amount keys, a proving mechanism set by entry of an item in said machine, means for automatically conditioning said proving mechanism to permit subsequent operation of the machine independent of said proving mechanism, and means controlled by said proving mechanism and said amount keys and conditioned auto matically prior to a subsequent operation of the machine in which said item is to be again entered for preventing said subsequent operation of the machine unless the same amount keys are depressed in entering said item as were depressed when it was first entered.

2. In combination, in a calculating machine havin depressible amount ke s, a proving mec anism associated with sai ke s and set by depression of the keys upon t e entry of an item thereon, devices controllable by said proving mechanism for preventing operation of the machine, and means for automatically conditioning said proving mechanism for control by said amount keys and-for control of operation of the machine entering an item thereon, means for automatically moving said proving mechanism to inactive position to permit subsequent operations of said keys independent oi? said provmg mechanism, said means acting automatically to move said proving mechanism to amount keys only are depresses in ente active position for a predetermined subsequent operation out the machine Where said item is to be again entered on said keys, and means controlled by said proving mechanism for preventing said subsequent operation of the machine unless the same amount keys are depressed in the second entry of said item as were depressed in first entry thereof.

l. In combination, in a calculating machine having depressible amount keys, a proving mechanism set by. the entry of an item in said machine, means for automatically conditioningsaid proving mechanism to permit subsequent operations of the machine independent of said mechanism, and

means automatically placed under the con trol of said amount keys and said proving mechanism alter predetermined number of operations or said machine :tor preventing operation of the machine until the same amount keys only are depressed as were do pressed when said item Was first entered thereon.

5. lln combination, in a calculating machine having depressible amount keys and means for operating the machine, a proving mocha-- nism set by depression oi the amount keys in entering an thereon, means for auto-- matically moving said proving mechanism to inactive position after it has been set to permit subsequent operations of the machine independent of said proving mechanism, and connections conditioned automatically operatively connect said proving mechanism With said operating means for a predetermined subsequent operation of the machine in which the same item is to be again entered on the amount keys, said amount keys acting through. said proving mechanism to prevent said predetermined subsequent operation of the machine unless the same amount keys are depressed upon the second entry out item as were depressed upon the first entry thereof.

6, In combination, in a calculating machine having depressible amount lreys and a traveling paper carriage, a proving mechanism set by the entry of an item in said machine, means coir olled by the carriage for automatically conditioning said proving mechanism to per subsequent operations Of'tllE machine independent of said proving mechanism, and

means conditioned by saidcarriage in a subsequent predetermined columnar position thereof and controlled by sald amount keys and proving mechanism for preventing operation the machine until the same said s were depressed when was 1; cute.

'3" Lin combination, in calculating machine having depressible amount keys and a travet ing paper carriage, proving mechanism menses associated With said keys and set by depression of the latter upon the entry of an item in a predetermined columnar position oi": the carriage, devices controllable by said proving mechanism for preventing operation of the machine, and means controlled by the carriage for automatically rendering said proving mechanism inactive to permit subsequent operations of the machine independently of said mechanism, said means also acting automatically to condition said proving mechanism for control by said amount keys in a subsequent predetermined columnar position of the carriage in Which said item is to be again entered to thereby prevent operation of the machine unless the same amount keys are depressed as Were depressed "when said item was first entered.

8. ln combination, in a calculating machine having depressible amount keys and a travelingpaper carriage, a proving mechanism set by depression of said amount keys in entering an item thereon in predetermined columnar position of the carriage, means controlled by said carriage for automatically moving said proving mechanism to inactive position it has been set to thereby permit subsequent operations of the machine independent of the proving mechanism, "said means acting automatically to move said proving mechanism to active position in a subsequent predetermined columnar position of the carriage Where said item is to be again entered on said keys, and means controlled by said proving mechanism for preventing l said subsequent operation of the machine When the same amount keys are not depressed in the entry or said item in subsequent columnar position of the carriage as were do pressed in the first entry.

9. In combination, in a motor driven calculating machine having depressible amount keys and a controlling mechanism for causing the motor to operate the machine, a proving mechanism set by the entry of an item in said machine, means for automatically conditioning said proving mechanism to permit subsequent operationsoft the machine independent of said proving mechanism, and means automatically conditioned prior to a subsequent operation of the machine which said item is to be again entered their. in and controlled by said amount keys and said proving mechanism -tor disabling controlling means unless the same amount keys are depressed in entering said item as were depressed in the first entry thereof.

10. In combination, in a motor driven calculating machine having depressible amount determined columnar position of the carriage, and means controlled by the carriage in a subsequent predetermined columnar po* sition thereof in which said item is to be again entered for conditioning said proving mechanism for control by said amount keys to disable the controlling mechanism from operating the machine until the same amount keys only are depressed in the second entry of said item as were depressed in the firstentry thereof.

11. In combination, in a motor driven calculating machine having depressibleamount keys and a controlling mechanism for causing the motor to operate the machine, a proving mechanism operatively associated with said amount keys and set by depression of them in entering an item thereon, means for automatically moving said proving mechanism to inactive position after it has been set to thereby permit subsequent operations of said keys independent of the proving mechanism, said means acting to automatically move said proving mechanism toactive position for a predetermined subsequent operation of the machine in which the item first entered is to be again entered on the keys, and means controlled by said proving mechanism for disabling said controlling mechanism when the same amount keys are not depressed in the second entry of said item as were depressed in the first entry thereof,

12. In combination, in a motor driven calculating machine having depressible amount keys, controlling mechanism for causing the a motor to operate the machine, and a traveling paper carriage; a proving mechanism set by depression of the amount keys in entering an item thereon in a predetermined columnar osition of the carriage, means controlled said carriage for automatically moving sai proving mechanism to inactive position after it has been set to thereby ermit subsequent operations of the mac ine independent of the proving mechanism, and connections controlled by said carriage for automatically connecting said proving mechanism with said controlling mechanism in a subsequent predetermined columnar position of the carriage where said item is to be again entered on the amount keys, said amount keys acting through said proving mechanism to disable said controlling meclr anism to thereby prevent operation of the machine unless the same amount keys are depressed upon the second entry of said item as were depressed upon the first entrythereof. I I

- 13. In combination, in a motor driven calculating machine having amount keys, a controlling mechanism for causing the motor to. operate the machine, and a traveling paper carriage; a proving mechanism associated with said amount keys and set by depression of said keys in entering an item thereon in a predetermined columnar position of the paper carriage, means operated by said paper carriage for automatically moving said prov ing mechanism out of operative relation with said amount keys when the paper carriage moves away from said predetermined columnar position, said carriage operated means acting to move said proving mechanism into operative relation with said amount keys in a subsequent predetermined columnar position of the carriage, and normally disconnected connections conditioned by said carriage in said subsequent predetermined columnar position for connecting said proving mechanism with said controlling mechanism so that manipulation of said controlling mechanism tends to move said proving mechanism, said amount keys acting to block said proving mechanism to disable said controlling mechanism when the same amount keys are not depressed in said subsequent columnar position of the carriage as were depressed in for automatically connecting said slides and operating means rior to a predetermined subsequent operatlon of the machine where the same item is to be entered on said keys, said keys acting to prevent said slides from moving sufiiciently to ermit said operating means to effect said subsequent operation of the machine unless the same amount keys are depressed in the second entry of said item as were depressed in the first entry thereof. 15. In combination, in a calculating ma, chine having banks of depressible amount keys, operating means for the machine, and a traveling paper carriage ;a slide for eachbank carrying detents adapted to be set by depression of the amount keys of its 'bank, means controlled by the carriage for automatically moving said slides to move said detents out of operative relation with the amount keys after said detents have been set by depression of the keys in entering an item thereon, and means controlled by the carriage for automatically connecting said slides to said operating means in a predetermined subsequent columnar position of the carriage, said keys acting to prevent said slides from moving to 

